soren has good points, specially "4."
There could be some cool new things which could be implemented to today´s pin. Lasers could be cool and add some new functions or at least look good.
BUT, please let´s keep pinball´s physical nature. For example, I do not like RFM, that crt-monitor makes that more a videogame, it feel less pinball IMO.
Some moving playfield parts maybe.. portion of playfield rises or lowers.